Piston valve for cornets



June 19, 1928.

A. J. JOHNSON PISTON VALVE FOR CORNETS Filed April 15, 1927 INVENTOR ATTORNE 1S Patented June 19, 1928.

UNITED STATES PATENT OFF-ICE.

ALFRED :I. JOHNSON, 0F GRAND RAPIDS, MICHIGAN, ASSIGNOR TO J. w. YORK &soNs,

' or GRAND RAPIDS, MICHIGAN.

PISTON VALVE FOB CORNETS.

Application filed April 13,

This invention relates to improvements in piston valves for cornetsor'similar wind instruments.

The object of the invention is to provide an improved piston and springmechanism for such valves.

A further object is to provide a structure which shall be easilyassembled and that will not get out of order in use and in which the keyaction shall be smooth and easy.

Objects relating to details of construction will appear from thedetailed description to follow. The invention is defined in the claims.A structure embodying the features of my invention is illustrated in theaccompanying drawing, in which:

Fig. 1 is an elevation view of a set of keys for a cornet or trumpet.

Fig. 2 is an enlarged detail elevation view of one of the valve pistonsand spring mechanism removed from the valve socket.

Fig. 3 is an enlarged detail sectional view taken on line 33 of Figs. 1,2 and 4, showing the detailed arrangement of piston socket and springmeans, the guide cap and key button being omitted.

Fig. 4 is a detail cross-sectional view taken on line 4-4 of Figs. 1, 2and 3, the spring being omitted.

Fig. 5 is a detail elevation view of the valve, key, stem and extensionpin in disassembled relation.

The parts are referred to by their nuinerals of reference which are thesame in all the views.

1 is the valve assembly of a cornet or trumpet. 2 is the valve casing. 3is the baluster. 4 is the baluster cap forming the guide for the keystem. 5 is the valve piston. 6 is the spring barrel slotted at 61. 7 isthe valve key stem. 8 is the key button. 9 is the return spring. 10 isthe star stop member for the spring with projections 101 over whichplays the vertical slot 61 in the spring barrel 6. j

The piston 5 is extended at 51, 51 at each side of the slot 61 andprovides an extension piston bearing surface. The valve casing 2 isprovided with the usual extension bearings 22 extending up into thebaluster 3. The valve stem 7 has a projecting flange or 1927. Serial No.183,361.

collar 71 with a screw-threaded boss 72 on its under side forming thevalve top.

The stem 7 is provided with a downwardly-extending pin 7 3 preferablyscrew-threaded thereto which serves to retain the spring 9 in line. 10is the star stop member which has extensions 101 which extend throughthe vertical slot 61 and engage in recesses in the valve casingextension 22. It is centrally perforated at 102 to receive the pin 73which reciprocates therethrough.

From this description it will be seen that when the key button 8 isdepressed, the valve plunger will be depressed, compressing the spring 9against the star stop member 10. When the pressure is released thespring returns the piston to normal, the same being very effectivelyguided by the engagement of the projecting ends 101. Because the pinextension 73 is disposed through a central aperture in the stop plate10, it cannot be displaced accidentally by striking the projecting ends,and the projecting ends are maintained in correct position to engage inthe slots 23*.

The structure can be somewhat modified without departing from myinvention, as defined in the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a valve structure for wind instruments, the combination of a valvecasing, a baluster, a piston with upwardly extended bearing surfaces atopposite sides, a spring barrel disposed between the bearing surfaceextensions with longitudinal slots, a spring within said barrel, aperforated star stop member within the spring barrel with extensionsthrough the said slots to engage the casing, and a key cap with stemwith a rod extension therefor disposed within the spring and extendingthrough the said star stop member, coacting as specified.

2. In a valve structure for wind instruments, the combination of a valvecasing, a baluster, a piston, a spring barrel, a spring within saidbarrel, aperforated star stop member within the spring barrel, and a keycap with stem with a rod extension therefor disposed within the springand extending "a baluster, a spring barrel, a spring Within said barrel,a perforated star stop member- Within the spring barrel, a pistonhavmg aupwardly extending bearing surface at 0ppositesides disposed abovesaidst-ar seat to 10 cooperate with the bearing surfaces of the valvecasing.

In Witness whereof I have hereunto set my hand.

seat for said star stop member and having Y ALFRED J. JOHNSON."

